Anisotropic plasmon dispersion and damping in multilayer 8-Pmmn borophene structures  

作　　者：Kejian Liu Jian Li Qing-Xu Li Jia-Ji Zhu 刘可鉴;李健;李清旭;朱家骥(School of Science,Chongqing University of Posts and Telecommunications,Chongqing 400065,China;Institute for Advanced Sciences,Chongqing University of Posts and Telecommunications,Chongqing 400065,China;Southwest Center for Theoretical Physics,Chongqing University,Chongqing 401331,China)

机构地区：[1]School of Science,Chongqing University of Posts and Telecommunications,Chongqing 400065,China [2]Institute for Advanced Sciences,Chongqing University of Posts and Telecommunications,Chongqing 400065,China [3]Southwest Center for Theoretical Physics,Chongqing University,Chongqing 401331,China

出　　处：《Chinese Physics B》2022年第11期510-514,共5页中国物理B（英文版）

基　　金：supported by the Scientific Research Program from Science and Technology Bureau of Chongqing City(Grant No.cstc2020jcyj-msxmX0684);the Science and Technology Research Program of Chongqing Municipal Education Commission(Grant No.KJQN202000639);in part by the National Natural Science Foundation of China(Grant No.12147102)。

摘　　要：We investigate the collective plasma oscillations theoretically in multilayer 8-Pmmn borophene structures,where the tilted Dirac electrons in spatially separated layers are coupled via the Coulomb interaction.We calculate the energy dispersions and Landau dampings of the multilayer plasmon excitations as a function of the total number of layers,the interlayer separation,and the different orientations.Like multilayer graphene,the plasmon spectrum in multilayer borophene consists of one in-phase optical mode and N-1 out-of-phase acoustical modes.We show that the plasmon modes possess kinks at the boundary of the interband single-particle continuum and the apparent anisotropic behavior.All the plasmon modes approach the same dispersion at a sufficiently large interlayer spacing in the short-wavelength limit.Especially along specific orientations,the optical mode could touch an energy maximum in the nondamping region,which shows non-monotonous behavior.Our work provides an understanding of the multilayer borophene plasmon and may pave the way for multilayer borophene-based plasmonic devices.

关 键 词：PLASMON 8-Pmmn borophene MULTILAYER two-dimensional materials 

分 类 号：TB34[一般工业技术—材料科学与工程] O53[理学—等离子体物理]